Controlled integration of metal oxide/carbon structures for clean energy storage and conversion has drawn much attention in recent years. However, designing the metal oxide/carbon with high conductivity and good cycle durability still remains a challenge. Herein, we demonstrate a facile synthesis of bimetallic CoNi-CoNiO₂ nanoparticles embedded into mesoporous carbon as electrode material (CoNi-CoNiO₂-CMK-3) for supercapacitor. The mesoporous silica is used as the template, Ni(NO₃)₂ and Co(NO₃)₂ as the Ni²⁺ and Co²⁺ precursor, and sucrose as the carbon source. The molar ratio of Co²⁺ (Ni²⁺)/sucrose and pyrolysis temperatures are carefully screened. Combining the advantages of mesoporous carbon and the uniformly distributed CoNi-CoNiO₂ particles, the composites exhibit well-defined capacitive features. Especially, the sample with 0.008 molar ratio of Co²⁺/sucrose and pyrolyzed at 800 °C display the highest capacitance up to 280 F g^-1 at 0.25 A g⁻¹ in 6 M KOH aqueous solution. In addition, 97.7% of the original capacitance is obtained after 10000 cycles. The high performance should be due to the fast ion-transport through mesoporous carbon and redox reaction on CoNi-CoNiO₂ particles.

近年来，用于清洁能源存储和转换的金属氧化物/碳结构的可控制集成引起了很多关注。然而，设计具有高电导率和良好的循环耐久性的金属氧化物/碳仍然是一个挑战。在本文中，我们证明了容易嵌入的双金属CoNi-CoNiO ₂纳米粒子嵌入到中孔碳中作为超级电容器的电极材料（CoNi-CoNiO ₂ -CMK-3）。使用介孔二氧化硅作为模板，使用Ni（NO ₃）₂和Co（NO ₃）₂作为Ni ²⁺和Co ²⁺前体，使用蔗糖作为碳源。Co ²⁺（Ni ²⁺）/蔗糖和热解温度经过仔细筛选。结合中孔碳和均匀分布的CoNi-CoNiO ₂颗粒的优点，复合材料表现出良好的电容特性。特别地，具有0.008摩尔比的Co ²⁺ /蔗糖且在800℃下热解的样品在6 M KOH水溶液中 在0.25 A g ^-1下显示最高的电容，直至280 F g ^-1。此外，在10000次循环后，可获得原始电容的97.7％。高性能应归因于在CoNi-CoNiO ₂颗粒上通过介孔碳快速进行离子迁移和氧化还原反应。